The theory that dark matter could be composed of tachyons is aspeculative idea in physics. Tachyons are hypothetical particles that, unlike normal matter, always travel faster than light. According to current understanding of physics, they violate the laws of causality and have yet to be observed. As for Dark matter,
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Our current understanding suggests dark matter should be fairly uniform throughout the universe. However, there are some interesting ideas scientists are exploring to explain potential variations: It’s important to note that these are all areas of active research, and there isn’t yet definitive evidence for any variations in dark matter
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